mockStatic(FacesContext.class)

and encounter the following error:

java.lang.IllegalStateException: no last call on a mock available
at org.easymock.EasyMock.getControlForLastCall(EasyMock.java:174)
at org.easymock.EasyMock.expect(EasyMock.java:156)

Check that you have prepared the Class for test using the @PrepareForTest annotation.

e.g.

@RunWith(PowerMockRunner.class)
@PrepareForTest(
{
	FacesContext.class
})
public class ....

An excellent article discussing mocking statics by one of the PowerMock developers can be found here: http://blog.jayway.com/2009/05/17/mocking-static-methods-in-java-system-classes/

Note that you also need to @PrepareForTest any classes where you are expecting a private method call with expectPrivate.  If you don’t, your test execution will try and go into the private method and actually run all the code. The @PrepareForTest annotation can either go at the method level as shown in the example below, or at the class level as shown in the example posted above.

@PrepareForTest(ClassUnderTest.class)
@Test
public void testNext() throws Exception
{
	String privateMethod = "isNextEnabled";
	ClassUnderTest partMock = createPartialMock(ClassUnderTest.class, privateMethod);
	expectPrivate(partMock, privateMethod).andReturn(true);
	replayAll();
	partMock.next();
	verifyAll();
}

It becomes useful if you consider the following method, where Voucher is an object that cannot be instantiated and needs to be mocked:

public class VoucherHelper
{
	public static boolean isVoucherExpired(Voucher voucher)
	{
		boolean expiredVoucher = true;
		Date expiryDate = voucher.getExpiryDate();
		if (expiryDate != null)
		{
			Date now = new Date();
			expiredVoucher = now.after(expiryDate);
		}
		return expiredVoucher;
	}
}

To test this method, there are 3 tests that need to be done.

• expiryDate returning null
• expiryDate returning an earlier date than the current date
• expiryDate returning a later date than the current date

This can all be done in one expectation line by chaining the ‘andReturn’ of the expectation.

@Test
public final void testIsVoucherExpired()
{
	Voucher voucher = createMock(Voucher.class);
	Calendar expiredDate = Calendar.getInstance();
	// Make it expired by taking a year off
	expiredDate.set(Calendar.YEAR, expiredDate.get(Calendar.YEAR) - 1);

	Calendar notExpired = Calendar.getInstance();
	// Make it not expired by adding a year
	notExpired.set(Calendar.YEAR, notExpired.get(Calendar.YEAR) + 1);

	// Test with date returning null, then returning expired, then returning not expired
	expect(voucher.getExpiryDate())
		.andReturn(null)
		.andReturn(expiredDate.getTime())
		.andReturn(notExpired.getTime());
	replayAll();
	assertTrue(VoucherHelper.isVoucherExpired(voucher));
	assertTrue(VoucherHelper.isVoucherExpired(voucher));
	assertFalse(VoucherHelper.isVoucherExpired(voucher));
	verifyAll();
}

EasyMock also allows chaining on the times method and the andThrow method, and all can be used at the same time if you wanted.

expect(voucher.getExpiryDate())
	.andReturn(null).times(2)
	.andThrow(new RuntimeException())
	.andReturn(new Date()).times(3);